thread.c: fix indent

* thread.c (threadptr_local_aset): fix indent, remove unnecessary
  braces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47002 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

thread.c

@@ -2831,14 +2831,12 @@ threadptr_local_aset(rb_thread_t *th, ID id, VALUE val)
 	st_delete_wrap(th->local_storage, id);
 	return Qnil;
     }
-    else {
     if (!th->local_storage) {
 	th->local_storage = st_init_numtable();
     }
     st_insert(th->local_storage, id, val);
     return val;
 }
-}
 
 VALUE
 rb_thread_local_aset(VALUE thread, ID id, VALUE val)